Now showing items 1-12 of 309

    • Polaron interactions and bipolarons in one-dimensional Bose bases in the strong coupling regime 

      Astrakharchik, Grigori (American Institute of Physics (AIP), 2021-09-03)
      Article
      Open Access
      Bose polarons, quasiparticles composed of mobile impurities surrounded by cold Bose gas, can experience strong interactions mediated by the many-body environment and form bipolaron bound states. Here we present a detailed ...
    • Influence of individual nodes for continuous-time susceptible-infected-susceptible dynamics on synthetic and real-world networks 

      De Bellis, Alfredo; Pastor Satorras, Romualdo; Castellano, Claudio (American Institute of Physics (AIP), 2021-07-01)
      Article
      Open Access
      In the study of epidemic dynamics a fundamental question is whether a pathogen initially affecting only one individual will give rise to a limited outbreak or to a widespread pandemic. The answer to this question crucially ...
    • Quantum phase transition of a two-dimensional quadrupolar system 

      Astrakharchik, Grigori; Kurbakov, I. L.; Lozovik, Yu. E. (American Physical Society (APS), 2021-04-01)
      Article
      Open Access
      Ensembles with long-range interactions between particles are promising for revealing strong quantum collective effects and many-body phenomena. Here we study the ground-state phase diagram of a two-dimensional Bose system ...
    • Estimation of the condensate fraction from the static structure factor 

      Lozovik, Yu. E.; Kurbakov, I. L.; Astrakharchik, Grigori; Boronat Medico, Jordi (American Physical Society (APS), 2021-03-16)
      Article
      Open Access
      We present an analytical method to estimate the condensate fraction n0/n in strongly correlated systems for which the zero-temperature static structure factor S(p) is known. The advantage of the proposed method is that it ...
    • Finite-range effects in the two-dimensional repulsive Fermi polaron 

      Bombín Escudero, Raul; Cikojevic, Viktor; Sánchez Baena, Juan; Boronat Medico, Jordi (American Physical Society, 2021-04-01)
      Article
      Open Access
      We study the repulsive Fermi polaron in a two-component, two-dimensional system of fermionic atoms inspired by the results of a recent experiment with 173Yb atoms [N. Darkwah Oppong et al., Phys. Rev. Lett. 122, 193604 ...
    • Triangular Gross-Pitaevskii breathers and Damski-Chandrasekhar shock waves 

      Olshanii, Maxim; Deshommes, Dumesle; Gonchenko, Marina; Dunjko, Vedran; Astrakharchik, Grigori (2021-01-01)
      Article
      Open Access
      The recently proposed map [arXiv:2011.01415] between the hydrodynamic equations governing the two-dimensional triangular cold-bosonic breathers [Phys. Rev. X 9, 021035 (2019)] and the high-density zero-temperature triangular ...
    • Thermal instability, evaporation, and thermodynamics of one-dimensional liquids in weakly interacting Bose-Bose mixtures 

      Rosi, Giulia de; Astrakharchik, Grigori; Massignan, Pietro Alberto (American Physical Society (APS), 2021-04-12)
      Article
      Open Access
      We study the low-temperature thermodynamics of weakly interacting uniform liquids in one-dimensional attractive Bose-Bose mixtures. The Bogoliubov approach is used to simultaneously describe quantum and thermal fluctuations. ...
    • Ionic polaron in a Bose-Einstein condensate 

      Astrakharchik, Grigori; Schmidt, Richard (2021-05-11)
      Article
      Open Access
      The presence of strong interactions in a many-body quantum system can lead to a variety of exotic effects. Here we show that even in a comparatively simple setup consisting of a charged impurity in a weakly interacting ...
    • Structural superfluid-Mott-insulator transition for a Bose gas in multirods 

      Rodríguez López, Omar Abel; Boronat Medico, Jordi (American Physical Society, 2021-01-14)
      Article
      Open Access
      We report on a structural superfluid–Mott-insulator (SF-MI) quantum phase transition for an interacting one-dimensional Bose gas within permeable multirod lattices, where the rod lengths are varied from zero to the lattice ...
    • Bridging NiCo layered double hydroxides and Ni3S2 for bifunctional electrocatalysts: the role of vertical graphene 

      Xiao, Zhang; Fan, Jiajun; Lu, Xunyu; Han, Zhaojun; Cazorla Silva, Claudio; Hu, Long; Wu, Tom; Chu, Dewei (2021-07-01)
      Article
      Restricted access - publisher's policy
      In this work, we report a bifunctional electrocatalyst with nickel sulphide (Ni3S2) as the template, vertical graphene (VG) as the bridging material, and nickel–cobalt layered double hydroxides (NiCo LDHs) nanosheets as ...
    • Superfluid vortex dynamics on a torus and other toroidal surfaces of revolution 

      Guenther, Nils Eric; Massignan, Pietro Alberto; Fetter, Alexander L. (American Physical Society (APS), 2020-05-04)
      Article
      Open Access
      The superfluid flow velocity is proportional to the gradient of the phase of the superfluid order parameter, leading to the quantization of circulation around a vortex core. In this work, we study the dynamics of a ...
    • Universal dimerized quantum droplets in a one-dimensional lattice 

      Morera Navarro, Iván; Astrakharchik, Grigori; Polls Martí, Artur; Julia Diaz, Bruno (American Institute of Physics (AIP), 2021-01-11)
      Article
      Open Access
      The ground-state properties of two-component bosonic mixtures in a one-dimensional optical lattice are studied both from few- and many-body perspectives. We rely directly on a microscopic Hamiltonian with attractive ...